The return to top button is displayed when the left side of jquery floats to a certain position
<script>
$(function(){
$(window).bind('scroll',function(){
if ($(document).scrollTop() >200) {
$(".asd-return").show(1);
}else{
$(".asd-return").hide(1);
}
})
$(".asd-return").click(function(){
$('body,html').animate({scrollTop:0},1000);
})
})
</script>